!Not Tested<ref name="NotTested">The Joomla! Project has not tested support for versions of software listed in this column. The Joomla! CMS may function properly on these versions of software, but official support is not provided.</ref>

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!Not supported<ref name="NotTested">The Joomla! Project has not tested support for versions of software listed in this column. The Joomla! CMS may function properly on these versions of software, but official support is not provided.</ref>

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|PHP<ref>Do not use PHP 4.3.9, 4.4.2 or 5.0.4. These releases have known bugs that will interfere with installation. Zend Optimizer 2.5.10 for PHP 4.4.x also has serious bugs and you should ask your host to upgrade to a newer version. Joomla! versions 1.5.15 + are compatible with PHP 5.3. Note that the OpenID library is not yet compatible with PHP 5.3.</ref>

|PHP<ref>Do not use PHP 4.3.9, 4.4.2 or 5.0.4. These releases have known bugs that will interfere with installation. Zend Optimizer 2.5.10 for PHP 4.4.x also has serious bugs and you should ask your host to upgrade to a newer version. Joomla! versions 1.5.15 + are compatible with PHP 5.3. Note that the OpenID library is not yet compatible with PHP 5.3.</ref>

↑The Joomla! Project has not tested support for versions of software listed in this column. The Joomla! CMS may function properly on these versions of software, but official support is not provided.

↑Do not use PHP 4.3.9, 4.4.2 or 5.0.4. These releases have known bugs that will interfere with installation. Zend Optimizer 2.5.10 for PHP 4.4.x also has serious bugs and you should ask your host to upgrade to a newer version. Joomla! versions 1.5.15 + are compatible with PHP 5.3. Note that the OpenID library is not yet compatible with PHP 5.3.

↑For Microsoft IIS (depending on your setup) you may need the following: